土木与环境工程学报（中英文）2026，Vol.48Issue(4)：80-88,9.DOI:10.11835/j.issn.2096-6717.2024.110
复杂岩溶区桩基钻探的溶洞梯度角判别与可靠性分析
Gradient angle identification of karst caves and reliability analysis for pile foundation drilling in complex karst areas
摘要
Abstract
In the construction of underground rock engineering,complex geological conditions are commonly encountered,especially special conditions such as karst caves and faults,which bring great challenges to pile foundation construction.To study the accuracy of pile foundation drilling data under complex karst geology,this paper takes the pile foundation project in Yinshawan Karst Area,Jiujiang,Jiangxi as the engineering background,and summarizes the spatial characteristics of cave gradient angles based on the drilling data of the whole site,and uses the JC method to analyze the reliability of drilling data.The results show that the cave occurrence rate of the boreholes in this karst pile foundation construction site exceeds 50%,and the karst is extremely developed.According to the four spatial distribution modes of cave gradient angle,the drilling data with higher accuracy of karst cave information are preferentially selected.The JC method is used to analyze the reliability of the data with lower accuracy,and it is found that the gradient angles calculated by taking small,medium and large cave depths as reference values all follow a normal distribution,and the accuracy of identifying cave characteristics via boreholes increases significantly with the increase of cave depth.Finally,to control the supplementary drilling rate,a data screening and optimization strategy is proposed.Through the comparison of quantitative indicators,it is verified that controlling the supplementary drilling rate at about 5%can significantly improve the reliability of drilling results.关键词
岩溶/桩基/梯度角/JC方法/超前钻探Key words
karst/pile foundation/gradient angle/JC method/advance drilling分类
建筑与水利引用本文复制引用
牟云贞,张勇,仉文岗,黄乐源,刘志伟,张犇溢,肖鹏,储亮..复杂岩溶区桩基钻探的溶洞梯度角判别与可靠性分析[J].土木与环境工程学报（中英文）,2026,48(4):80-88,9.基金项目
长江重庆航道工程局科技项目(H20230330) （H20230330）
重庆市自然科学基金创新发展联合基金(CSTB2022NSCQ-LZX0001) （CSTB2022NSCQ-LZX0001）
大足石刻研究院科研委托项目(GF-2000-0203) Chongqing Yangtze River Waterway Engineering Bureau Science and Technology Project(No.H20230330) （GF-2000-0203）
Chongqing Natural Science Foundation Innovation and Development Joint Fund(No.CSTB2022NSCQ-LZX0001) （No.CSTB2022NSCQ-LZX0001）
Dazu Rock Carving Research Institute Commissioned Project(No.GF-2000-0203). （No.GF-2000-0203）
